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Fuel tank - air lock

Yoda

Yoda

PCGB Member
Member
A slightly strange thing happened on the way home from Oulton Park yesterday, I was on the motorway at a steady pace and the car began to jerk/hesitate a little as if it was suffering from fuel starvation. Pulled over in a service station and had a quick look around, opened the fuel cap filler valve etc. Got back on the motorway and the car was fine all the way back.

Any idea why this happens and what's the best way to avoid. Caused mild panic for a few seconds when it first happened which I would like to avoid again. Ajit suggested filling the tank fully to expel any air that was left - any other thoughts?
 
It maybe that the tank was 'vacuuming', so releasing the fuel cap would have temporarily cured it. I don't know if the 911 petrol tank is a 'sealed system' with some sort of air valve arrangement. The valve had probably blocked. If you filled the tank up then the air would have less to expand so the vacuum effect would have appeared again.
Whilst I have never noticed it on the 964 I do get a whoosh sound (rush of air into the tank)when I release the fuel cap on the 944.
Cheers,

p.s. Enjoyed Oulton Park as a spectactor (and the passenger ride with Mel).
 
Probably objecting to being driven so slowly after your day out at Oulton Park.

I would head for vacuuming effect or possibly dislodging the odd bit of crud in the bottom of your tank, dont worry if it doesnt happen again.
 
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